Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove connector X3 from the PCB
Remove the plug from the pump assembly

Measurement:

Measure the resistance of each of the wires in the harness.
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the wiring and connectors.
Note:
Pump plug may differ in appearance
but test remains the same.